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Properties of hadronic events in e+e− annihilation at $S^(1/2)$ = 91-GeV

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • ALEPH Collaboration
<mark>Journal publication date</mark>1990
<mark>Journal</mark>Physics Letters B
Issue number1-2
Number of pages10
Pages (from-to)209-218
Publication StatusPublished
<mark>Original language</mark>English


We report on properties of hadronic events from e+e− annihilation observed by the ALEPH detector at the large Electron Positron Collider at CERN. The center-of-mass energy was . Measured distributions of the global event-shape variables sphericity, aplanarity, thrust and minor value, and of the inclusive variables xp, p⊥in, p⊥out and y are presented. We measure a mean charged multiplicity in hadronic events of 〈Nch〉=21.3±0.1 (statistical)±0.6 (systematic). The data are in good agreement with QCD-based models which use the leading-logarithm approximation, and are less well described by a model using O(αs2) QCD.